Quantized thermoelectric Hall plateau in the quantum limit of graphite as a nodal-line semimetal

We performed thermoelectric Hall conductivity ${\ensuremath{\alpha}}_{xy}$ measurements on single-crystal graphite in the quantum limit up to 13 T. Both electrical and transport were same crystal extract pure ${\ensuremath{\alpha}}_{xy}$, avoiding any sample quality dependence. The converges a plateau with linear dependence temperature. This behavior is analogous quantized effect (QTHE) observed three-dimensional Dirac/Weyl nodal-point semimetals, experimentally confirms theoretical proposal QTHE semimetals nodal lines as graphite.